How can I get python to print out the current elapsed time while a function is running?

Question

So I currently have python printing how long it took for a function to run after its done running with something like:

import time t = time.time() # do something in here print "\n Time Taken: %.3f sec" % (time.time()-t)

but I want to show the live time that has passed since the function has started, and I cant quite figure out a way to get that to happen.

for example in a terminal I want it to say something like:

Working on xFunction. Time Elapsed 72.485 sec... (live updated time) xFunction Has finished. Time Taken: 1152.546 sec

Any help would be appreciated.

Note that OP seems to want a live display of elapsed time (as title already suggests, but question text doesn't). — handle
– handle, Commented Jun 5, 2017 at 19:50
Why don't you put that printout in between whatever statements that function has? — Mad Physicist
– Mad Physicist, Commented Jun 5, 2017 at 19:52

import random · Accepted Answer · 2017-06-06 04:54:45Z

Here's an example with a thread that will print how much time has elapsed since it started and can be stopped from the main loop.

import time import threading class ElapsedTimeThread(threading.Thread): """"Stoppable thread that prints the time elapsed""" def __init__(self): super(ElapsedTimeThread, self).__init__() self._stop_event = threading.Event() def stop(self): self._stop_event.set() def stopped(self): return self._stop_event.is_set() def run(self): thread_start = time.time() while not self.stopped(): print("\rElapsed Time {:.3f} seconds".format(time.time()-thread_start), end="") #include a delay here so the thread doesn't uselessly thrash the CPU time.sleep(0.01) if __name__ == "__main__": start = time.time() thread = ElapsedTimeThread() thread.start() # do something time.sleep(5) # something is finished so stop the thread thread.stop() thread.join() print() # empty print() to output a newline print("Finished in {:.3f} seconds".format(time.time()-start))

This gives the following output, with the Elapsed Time counting up from zero and being overwritten:

J:\>python thr_time.py Elapsed Time 5.000 seconds Finished in 5.001 seconds

Note that this code is in Python 3. More info on stopping threads here & here.

Let me know if you'd like clarification on any portions.

Miguel Tomás · Accepted Answer · 2021-03-17 10:34:01Z

I've modified @import_random 's code to enable the ability to probe elapsed time at any time during the execution of code, by wrapping 2 functions for initialization and finalization of ETC:

import time import threading class ElapsedTimeThread(threading.Thread): """"Stoppable thread that prints the time elapsed""" def __init__(self): super(ElapsedTimeThread, self).__init__() self._stop_event = threading.Event() self.thread_start = time.time() def stop(self): self._stop_event.set() def stopped(self): return self._stop_event.is_set() def getStart(self): return self.thread_start def getCurrentTime(self): print("\rElapsed Time {:.3f} s. ".format(time.time()-self.thread_start), end="", flush=True ) def run(self): self.thread_start = time.time() while not self.stopped(): print("\rElapsed Time {:.3f} s. ".format(time.time()-self.thread_start), end="", flush=True) #include a delay here so the thread doesn't uselessly thrash the CPU time.sleep(0.01) def startTimeCounter(): threadTimer = ElapsedTimeThread() threadTimer.start() return threadTimer def stopTimeCounter(threadTimeCounter): print() # empty print() to output a newline print("Finished in {:.3f} s. ".format(time.time()-threadTimeCounter.getStart())) threadTimeCounter.stop() threadTimeCounter.join()

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